Privacy

If you don`t care about your privacy use cloud computing. This is a negative review of a bad idea

Remove sensitive data from your computer using Eraser, a free security tool that will delete files beyond recovery.

Check an unknown file or an URL with almost all known antivirus engine. VirusTotal allows you to do this for free, the only requirement, max 20 MB per file

In my opinion a social networking website doesn`t contribute to our evolution. It is something that shouldn`t exist or at least to benefit from less attention.