What are the cons of Twitter and facebook?

Here are some cons of Twitter and Facebook:

-Limiting 140 characters at a time. Some people could not post at limited Word. (Twitter)

-Presence of spam, worm attacks

-Squatters and fake accounts

-More features: the more features an application has, the harder it can be to navigate

-Ads & Spam: especially on very open networks that anyone can join

-Social Media Addiction

Hope these helps.