A pillar in the architechural sense is a column that holds up the front or sides of a building. In a social sense, a "pillar of the community" means someone who is so important that they are part of the bedrock, the foundation, the core of a community. Here, it means someone who cares enough to post 1,000 times - so is a pillar of this community!

So congratulations to both you, and to Esster who are now both pillars!