It's happened: Giants great Eli Manning has officially joined Twitter'Once a Giant, Always a Giant, Only a Giant'5/23/2020, 5:33 PMDec 15, 2019; East Rutherford, NJ, USA; New York Giants quarterback Eli Manning (10) drops back to pass during the first quarter against the Miami Dolphins at MetLife Stadium. Mandatory Credit: Vincent Carchietta-USA TODAY Sports / Vincent Carchietta