Although the Internet offers a lot of benefits for the college researcher, there are limitations:
Size - because there is so much information on the Internet, it can be difficult to wade through the trivial to get to the scholarly content
Permanence - content is always in flux, being changed, updated, archived, deleted (* for archives, see the Wayback Machine)
Accountability - because it can be difficult to track down the content owner, author, sources of some information, it can be difficult to trust everything on the Internet
Missed information - most people do not click past the first page of their search results (in 2011, 75% did not go past page one according to Search Engine Journal)
Surface Web Only - not only do most search engines miss "deep web" databases (content not indexed by a search engine because it exists within a structure requiring separate searches) but there is a lot on the web that can only be accessed by a subscription (example: library databases) or pay-per-article fee