Yarning for Some Answers

This weekend we noticed a lamp post on Hayes Street that's staying warm for winter. Positioned between Buchanan and Webster, this light fixture is covered with a sleeve of white & navy blue yarn.

It got us thinking: has this been here for awhile, or are we the recent victim of a yarnbomb?

A few weeks ago, SF Weekly reported that the Castro had been yarn bombed over night. First made popular in Houston, yarnbombing occurs when people wrap public utilities or structures in yarn.

Given that there are initials on this sleeve, we have a feeling there's some symbolism or significance attached to the knitting. Does anyone know the story behind this?