This is a private ad site for a limited and private user base.
The users define in their profile the categories that interest them (for the reception of announcement) and for which they are party (for the reception of request)
We could use Wordpress as the engine.
1 / The presentation of the site must be attractive (Theme), luxury
2 / Different categories of products / announcement proposed.
A homepage that changes order of the articles presented according to the interests of the connected user.
For example if the user is reversed by real estate first, he will see these ads displayed first.
The order is always from the most recent to the oldest.
3 / A button Make a request / request
4 / A part My account
In my account:
-Modify interests and ability to establish an order of preference
-View requests received
-Modify its coordinates
-Possibility to choose the frequency of alerts
5 / On each advertisement, possibility to ask questions.
The questions appear anonymously to all once validated and the webmaster can answer
Possibility of marking the announcement "interesting". Users see that the ad is interesting
Watermark on images with a code that changes per user (the watermark is generated in the display)
6 / Protection system to prevent unauthorized access. At the login, check if the ip is not the usual ip (or an ip previously registered): request to confirm the date of birth + alert to the webmaster
7 / Push mail system (via Mailchimp / Mailjet) to the profiles that match when a new advertisement is published
Same with applications but moderately
8 / A system of ecommerce via paypal or another means of payment for the live sale of small items that are in stock