I suspect that facebook tagged my domain

Over the past 3 months that my page of 500 thousand fans, failed to send more than 200 people online for article shared. The reach and engagement has fallen dramatically, I thought it was a punishment from facebook on my page, but what I discovered was the opposite.
Any site that I share on the page, as long as it's not mine, it's got back and sends more than 1,000 people online for article! I.e. facebook tagged my domain? What can I do? I complained to facebook ads Manager, but he says don't have knowledge of anything! I wouldn't want to change the domain of my website, because I will lose all of your background in seo.

What to do? Anyone else been through this?

About seo, isn't your traffic coming from Facebook only with 500K likes? i would advice you do a 301 redirect or buy the same domain name but with a different TLD. Why am saying this, is because you're leaving money on the table.

Goodluck on any decision you take.

I think you are not getting new & real like. And the old audience are not interested to you site. If FB Punished / Banned your domain you cant post the link.

I would like to suggest you get more new real likes & Improve your post Quality.

K.H.R you do not understand.

All likes were obtained by facebook ads, I made a great investment for these fans.

The site is not banned, it can be shared, but I can't send more than 200 people online for this site, regardless of the article. The same article that sends 150 people to the shared site on my page, using this same article with another domain (site) shared on my page sends 1,500 people.

getting another domain and redirecting it to your main domain is the easiest way to go i think, all that matters is the traffic in the end, right?

Did you solve the problem? at the moment i have the same problem and think i have to change the domain

Facebook Wants you to invest more

FB has recently improved it's algorithm to target sites which use clickbait type headlines and/or low quality content. According to a statement from FB, if a visitor sent from FB comes back from your website to the FB feed looking for new content within a very short duration, it means he/she did NOT find the content useful (quite similar to how Google estimates and uses bounce rate as a ranking factor in it's algorithm). Similarly the algorithm also takes into account the % of visitors who come back and like, comment or share the story after reading the content on your website. Based on these and a few other metrics, the reach for the articles shared from a particular domain name on a particular page gets affected. This is not calculated on a one-time basis but on a continuous basis. Although a new domain will offer you a better reach for a couple of days, once there is a decent sample size for FB to analyze, your reach will go down again since the content you are posting will be similar in nature and hence will provide similar metrics.

So, the problem is not with the domain, it is with the content you are sharing on your page.

Its pretty simple - your old domain has been flagged too often by users as spam, stuff they don't want to see, hide status etc pp.
The "fight clickbait" bla of FB is BS because the interaction of users that click on this kind of stuff is usually good.
New domain (as mentioned a few times already) - problem solved!

where did you complain?
i wouldnt mind having a link where they reply to you

Just get a new domain and 301 the old one. That should do - or is your domain so special that you stick to it?

I have one question.
I have been posting to fb groups more than 5 months from fake accounts. I was posting articles from my site and everyday I get around 5000 to 10000 visits. But last 3 days when I start posting to groups at first i get real time visitors as before but than after 5 minutes they start to decrease. ( for example from 150 real time visits t only 6-10 people ). My posts are still in the groups and my fb accounts active.
My question is: Is it possible that facebook mark my site as spam and now my site doesn't get reach enough?
Tnx