Generally speaking, if a site isn't listed under the news articles for the stocks on Yahoo! Finance, it's insignificant and generally won't affect the market.
Trashy scam websites like the ones you are referring to generally don't manage to change anything.
Update: Chances are, unless said websites are posting major speculatory news, it won't make much of a difference. The usual news you see for the companies that actually do result in major price moves are generally already available all over Yahoo! and Google Finance. You'll probably get further analyzing how legitimate websites affect penny stocks (a lot of sites cover penny stocks, like Fool), but if you're doing this as some sort of research report for school, then I feel you might not reach a solid conclusion, and will not be able to make an accurate inference. No two news articles are the same, especially if they're for different stocks (maybe it'll affect another stock if it's in the same industry, like the parallel movement between PLUG and BLDP, but that's a rare example).
My best advice is to choose another topic. I would have zero interest in reading an academic paper on penny stock alerts. Low volume + wide spreads + manipulation = no interest.
None of the SCAM sites want their picks tracked, so I doubt they would supply the data.
There are semi-regular attempts to spam Yahoo Answers from penny stock sites, but those posts get deleted pretty quickly via Community Moderation. Your question is technically a violation based on the commercial links.
Here are a few pump and dumps from YA that I've reported to the SEC over the last year or two: PVCT (current), AOIL, BLGO, AQUM, AMBS, MDIN, TAGG, LQMT.
Recent concentrations of SCAMS are in biotech, energy, medical marijuana.
EDIT 6/30/14: new one today = PBYA
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I am studying the impact that these websites (the majority of which are scams) have on the market place. I subscribed to a few and I get their picks. I am getting about one stock pick per week. To run my analysis I need upwards of 50 picks. I only have a few months (not years) to do this. Is there anyway I could get a list of some websites' all prior picks, or a copy of the emails they sent out the last few years?
Just for clarity, these are the types of websites i am looking at.
http://stockoftheweek.net/
http://www.123stockalerts.com/penny-stocks.php
http://www.pennystockcrew.com/
