A pair of convincing quarterly earnings beats -- not to mention a profitability guidance raise -- made AbbVie (ABBV 3.10%) stock an investor darling on Friday. The pharmaceutical company's performance pushed its stock to a more than 3% gain on the day, well higher than the 0.6% bump of the bellwether S&P 500 index it's a part of.The top line was topsFor its first quarter of this year, AbbVie's net revenue was $13.3 billion, representing a sturdy 8% improvement on a year-over-year basis. Much of this was due ...