Buy low, sell lower?

Well, nobody can guess the exact bottom. Buying, even yesterday, may not look so bad if you look at the 1+ year chart. Unless you're into day trading.

Technology stocks are a terrible sector to look at on the long term because there's so much churn. A company with one product that's saturating the market and/or being bypassed by the competition usually never recovers. All they showed is that they happened on a good product/market fit once and were able to execute, but can they reproduce this with a different product? Even Apple struggles with this now (Apple Watch) and they've had multiple record successes.

I too own TWTR! I bought shares because my friend did. I have zero investment discipline. So now I just put every penny into my mortgage.