Kathy Caprino's recent excellent blog (link below) on how to reach out to a stranger on LinkedIn highlighted one of the biggest mistakes I've seen people make on LinkedIn. 

Here's how the scenario goes - 

1. A stranger sends me an invitation to connect (always personalise your invitation, please).

2. I decide to connect with that person.

3. I immediately receive an email from that person via LinkedIn - it is an obvious 'copy and paste' sales blurb. 

5. Any positive vibe I had gotten from that person's profile is destroyed. 

6. I remove the connection.

LinkedIn is not for selling - it's for building great business relationships.  Please, take your selling offline and get to know me first!