LinkedIn

It's a 'hot' company, that's about all.

Blind technology leadership, and a "not invented here" attitude towards standard open source technologies.

For example, the 'open sourced' Zoie project implements a cheap hack for real-time search using Lucene, which was presented to and rejected by Twitter.

Voldemort is yet another copy of Amazon's Dynamo; however, it falls far short of Cassandra.

LinkedIn has numerous open source and internal projects that show technology comes last, and egos come first.

Money wasted on 4th or 5th rate technology is not in an investor's best interest. Headcount that doesn't produce anything worthwhile is a waste and should not be kept around to boost the egos of managers.