Unless the files are protected with authentication you should avoid these sites for business use. Check out this article: Hard data on why your users should avoid file-sharing sites.
The researchers intentionally created a slow crawler, so they wouldn’t get knocked off any of the hosting sites. The result? One month of harvesting netted 310,735 unique files, including 27,700 JPEGs, 13,400 ZIPs, 7,000 PDFs, 4,000 DOCs, 1,200 XLSs, and almost 1,000 PPTs. They even came up with a handful of SQL files — presumably databases sitting there on the file-sharing sites, ripe for the taking.