You "need" to, in the same way an engagement ring "needs" to be diamond and cost 3x your salary. Certain things matter!
WTF? We're talking about a PHONE CALL vs a tweet for your mom not spending $20K. If you can't spare five minutes, don't bother with a tweet (unless you're in Iraq, the South Pole etc.)
What matters even more is showing your appreciation outside of one designated day a year, or a shiny piece of carbon.