Aggressive selling hits social-media stocks.
Will traders remember last year's lesson on biotechs?
Fed news doesn't give advantage to bulls or bears.
High volatility may follow tomorrow's Fed news.
What's ahead: Quick recovery or more weakness?
Market behaving worse than in similar moments of recent years.
Rally comes with low volume and active selling pressure.
But prices may climb as weekend nears.
It's not too early to ponder better days ahead.
Greece, earnings may be market movers this week.