I understand from the owners of another forum running that this is a feature of the forum software (vBulletin).
If nothing is implemented or configured, outside of marking someone as a "friend" it performs no other purpose.
Don't sweat the small stuff.
ANNOUNCING the 19th Annual WASHFest 2014, The South Hills Hamfest, Sunday, 23 February 2014.
Located at the Castle Shannon VFD Memorial Hall, State Route 88 (Library Road) at Grove Road, Castle Shannon PA., ~ 10 minutes from downtown Pittsburgh.
[From Downtown, Take the Liberty Bridge across the Mon, go through the Liberty Tunnel, then turn onto SR 51 South to SR 88]
Talk-in on N3SH/R 146.955 - and N3FB/R 443.650 + (131.8 PL).
See you there!