Shares of Twitter (TWTR) - Get Report are higher and Facebook (FB) - Get Report opened lower on Friday and The Finish Line (FINL) raised its earnings outlook for the year. Shares of Twitter continue to move lower this morning after RBC Capital essentially downgraded the stock to SELL on worries about ad revenue. Analysts at RBC had been neutral on Twitter's shares. They cut their price target to $14 from $17. Facebook shares are also lower this morning. The social networking giant was found to have overestimated a key video metric for two years. Facebook says the error has been corrected but it's an embarrassment for Facebook, which has been touting record growth in video consumption. Moving to the upside this morning are shares of The Finish Line. The sporting goods retailer posted stronger-than-expected sales for its latest quarter. The finish line also raised annual guidance for both same store sales and earnings.