Yes please watch out for posts like these. I got a treemail a couple days ago from someone wanting to trade or buy a philodendron I have. The person who mailed me had just joined the site the day they mailed. They had no other posts, no plants in the database, no photos, no plants in a plant list. In the course of our brief contact the person said something like 'I joined this site just so I could message you about this plant'. Now what does that sound like to you? Sounds suspicious to me.