Escrow Systems: Does this fourm have a built-in escrow service? How does it work?
The forum itself does not have such a built-in escrow service. However, there are long term reputable members who offer such service. Some are mentioned in this list -
https://bitcointalk.org/index.php?topic=5047302.0 (disclaimer the list has taken a while without being updated, please DYOR and ask any questions when you are not sure)
Safety Tips: How do you distinguish between legitimate users and potential scammers?
1. You look at the reputation of the account, you read the feedback left on their profile
2. You look at their thread and the past deals they have made
3. Make sure the user is still active in the forum
4. Read the sticky threads on the appropriate board, you will see more guidelines.
Red Flags: Are there any specific warning signs I should look out for?
1. When you receive service offers through PM
2. The posts and messages from newbies should not be taken lightly. Most of the accounts are created to scam
3. Look out for negative trust rating, trust flags on the profiles and suspicious posting patterns
No past successful trading deals