In the spirit of releasing part four of my Wikipedia Links series we’re going to spend a couple posts delving into good ol’ black hat. Starting with of course; scraping. I’ve been getting a few questions lately about scraping and how to do it. So I might as well get it all out of the way, explain the whole damn thing, and maybe someone will hear something they can use. Lets start at the beginning.
What exactly is scraping?
Scraping is one of those necessary evils that is used simply because writing 20,000+ pages of quality content is a real bitch. So when you’re in need of tons of content really fast what better way of getting it than copying it from someone else. Teachers in school never imagined you’d be making a living copying other peoples work did they? The basic idea behind scraping is to grab content from other sources and store it in a database for use later. Those uses include but not limited to, putting up huge websites very quickly, updating old websites with new information, creating blogs, filling your spam sites with content, and filling multimedia pages with actual text. Text isn’t the only thing that can be scraped. Anything can be scraped: documents, images, videos, and anything else you could want for your website. Also, just about any source can be scraped. If you can view it or download it, chances are you can figure out a way to copy it. That my friend is what scraping is all about. Its easy, its fast and it works very very well. The potential is also limitless. For now lets begin with the basics and work our way into the advanced sector and eventually into actual usable code examples.
The goals behind scraping?
The ultimate goal behind scraping are the same as actually writing content.
1) Cleanliness- Filter out as much garbage and useless tags as possible. The must have goal behind a good scrape is to get the content clean and without any chunks of their templates or ads remaining in it.
2) Unique Content- The biggest money lies in finding and scraping content that doesn’t exist yet. Another alternative lies in finding content produced by small timers that aren’t even in the search engines and aren’t popular enough for anyone to even know the difference.
3) Quantity- More the better! This also qualifies as finding tons of sources for your content instead of just taking content from one single place. The key here is to integrate many different content sources together seamlessly.
4) Authoritive Content- Try to find content that has already proven itself to be not only search engine friendly but also actually useful to the visitors. Forget everything you’ve ever heard about black hat seo. Its not about providing a poor user experience, infact its exactly the opposite. Good content and user experience is what black hat strives for. It’s the ultimate goal. The rest is just sloppiness.
Where do I scrape?
There are basically four general sources that all scraping categorizes into.
1) Feeds- Real Simple Syndication feeds(RSS) are one of the easiest forms of content to scrape. Infact that is what RSS was designed for. Remember not all scraping is stealing, it has its very legitimate uses. RSS feeds give you a quick and easy way to separate out the real content from the templates and other junk that may stand in your way. They also provide useful information about the content such as the date, direct link, author and category. This helps in filtering out content you don’t want.
2) Page Scrapes- Page scrapes involve grabbing an entire page of a website. Than through a careful process, that I’ll go into further detail later, filter out the template and all the extra crap. Grab just the content and store it into your database.
3) Gophers- Other portions of the Internet that aren’t websites. This includes many places like IRC, newsgroups…..all hell here’s a list -> Hot New List of Places To Scrape
4) Offline- Sources and databases that aren’t online. As mentioned in the other post encyclopedias, dictionary files, and let us not forget user manuals.
How Is Scraping Performed?
Scraping is done through a set methodology.
1) Pulling- First you grab the other site and download all its content and text. In the future I will refer to this as an LWP call, because that is the CGI module that is used to perform the pull action.
2) Parsing- Parsing is nothing short of an art. It involves grabbing the page’s information (as an example) and removing everything that isn’t the actual content (the template and ads for instance).
3) Cleaning- Reformatting the content in preparation for your use. Make the content as clean as possible without any signs of the true source.
4) Storage- Any form of database will work. I prefer mysql or even flat files (text files).
5) Rewrite- This is the optional step. Sometimes if you’re scraping nonoriginal content it helps to perform some small necessary changes to make it appear as an original. You’ll learn soon enough that I don’t waste my time scraping content if it isn’t original (already in the engines) and focus most of my efforts on grabbing content that isn’t used on any pages that would already exist on search engines.
In the next couple posts in this series I’ll start delving into each scrape types and sources. i’ll even see about giving out some code and useful resources to help you a long the way. How many posts are going to be in this series? I really have no idea, its one of those poorly planned out posts that I enjoy doing. So I guess as many as are necessary. Likewise they’ll follow suite with the rest of my series and increasingly get better as the understanding and knowledge of the processes progresses. Expect this series to get very advanced. I may even give out a few secrets I never planned on sharing should I get a hair up my ass to do so.