Heard of these? MFA or Made For Adsense sites are simple websites that more often than not are literally thrown together.
They usually serve no purpose other than to display Adsense ads, and hopefully attract enough traffic to make some money from clicks on the ads.
Private label articles are the favourite choice here, although PLR ebooks can also be used.
Nine times out of ten the PLR articles are used as is, with no editing whatsoever. That doesn't work so well though because when a search engine finds duplicate content, it will only rank the content source it decides is most relevant to the keyword searched.
Hoping to make their PLR article appear unique to search engines when compared to copies of the same article used on other websites, some MFA webmasters process it first with an automated article rewriter.
Usually these are simply thesaurus based synonym replacers that change certain words for other "similar" words. Some also include an option to add paragraphs of text at the start, in the middle and at the end of the article (wow!).
Unfortunately, not only does rewriting software like this tend to turn articles into junk, it doesn't fool the search engines anyway.
It is possible to use a single source file to create many unique, derivative versions of an article which will overcome the duplicate content problem, but it takes a lot more time, requiring a semi-automated solution known as an article spinner or content spinner.
Income From MFA Sites
Although there's definitely money to be made with MFA sites, most people don't make much. That's usually either because they don't use traffic-generating, high quality PLR content that people will link to, or they don't have enough reach (not enough pages in the SERPS) to make low quality PLR content work – since content like this only occasionally shows up on the first page of search results you need a lot of it to generate traffic.
If you want to go the route of high quality PLR content, you either need to put in the time required to create it, or buy strictly limited distribution PLR article packs. Alternatively, you can use a service like Private Niche Empire which will give you 10 sites a month in pre-researched niches, and employs RSS feeds to create content unique to each user.
Using low quality PLR content invariably means you'll need a large network of MFA sites to make more than a few cents a day. That being the case, rather than use PLR articles or ebooks, a better route is probably to either buy cheap packages of ready-to-use PLR MFA sites that you can throw up one after another, or go completely black hat and use something like YACG Mass Installer to create MFA networks in minutes.