All lost and found is a static website / database. Meaning when you post your lost item, it sits as a static record on this site for 30 days unless you remove your listing before.
The benefit of this is that anyone can search the site using keywords and/or categories as well as location to find an item, making the chances of a match much higher than if they were searching for a post via a facebook page.
Social media is a very effective tool in spreading the word about something, but no so effective in cataloging and filing posts so they are easy to find at a later date. In other words, once the post disappears down the timeline, unless you can remember which facebook page it was on or who posted the item, your chances of finding something you have seen previously is down to luck and perseverance.
The answer to this dilemma is: All lost and found (ALAF). Once you ad your listing to ALAF, you can then share that listing to as many social media pages as you like to spread the word. When it appears on your social media page, it will link to the all lost and found website and display full details. That way, down the track if your item is found, all the finder needs to do is go to All Lost and Found to search for the item reported lost, instead of searching endless social media pages to find it.
Listings are FREE, so give it a try, you have nothing to lose!