U.S. STOCKS-Wall St to open lower after GDP offsets jobs data
* Exelon to buy Pepco Holdings, Pepco shares rally
* Twitter, EBay shares down a day after results
* FOMC statement due later in the day
* Futures dip: Dow 2 pts, S&P 2 pts, Nasdaq 10 pts (Adds jobs, GDP data, comment; updates prices)
By Rodrigo Campos
NEW YORK, April 30 (Reuters) - U.S. stocks were set to fall at the open on Wednesday after data showed the economy grew at a sharply lower-than-expected pace in the first quarter, but gains in private payrolls kept losses in check.
* Gross domestic product expanded at a 0.1 percent annual rate, the slowest since the fourth quarter of 2012, as exports and inventories weighed, but activity already appears to be bouncing back. It was a sharp pullback from the fourth quarter's 2.6 percent pace.
* U.S. private employers, however, beat expectations by adding 220,000 workers in April, the highest amount since November, and gains in the prior month were revised up to 209,000 from 191,000.
* Twitter shares fell 11.5 percent premarket a day after it posted earnings that showed lackluster user and usage growth for the second consecutive quarter. Continuación...