List of standard lengths for database fields

Question

I\'m designing a database table and once again asking myself the same stupid question: How long should the firstname field be?

Does anyone have a li

Answer 1

These might be useful to someone;

youtube max channel length = 20
facebook max name length   = 50
twitter max handle length  = 15
email max length           = 255 

http://www.interoadvisory.com/2015/08/6-areas-inside-of-linkedin-with-character-limits/