There is a pretty huge lag in seeing current posts on the forums. Looks like the technology is not picking up all the posts either. Wouldn't use this to keep track of the SolidWorks forums. I would be suspect that I am getting all relevant posts, etc if I was using as a search tool.
I am pretty sure the Netvibes technology depends on RSS feeds. Not sure how Exalead works. Appears that the sources are not set to output up to date index files or RSS feeds very often.