3 dot menu on the post, then click on the user in the menu. That will take you to their profile so you can block them. Also, I believe clicking on the user/community name is a toggleable option in sync.
On a post in the feed, hit the three dot button and filter out that user/community or instance. If you want to block rather than just filter, go to the bot user profile and hit block in the top bar.
Soapbox opinion time. Post spamming to parallel communities across instances is antithetical to federation.
Post spamming discourages users from federating with parallel communities on federated instances because users who do end up with feeds congested with duplicate posts. This encourages unsubscribing which results in reduced engagement across communities and isn’t fair to other contributors who choose not to post spam. The alternative would be to block the post spammer, which wouldn’t be ideal either, since articles are often still worth reading.
If a post spammer is concerned about visibility from defederated instances, then I suggest using an instance that federates to more instances. Furthermore, please respect an instance’s choice to defederate from yours if that’s where you choose to be. If your instance was defederated from another, that means the users there do not want to see any posts from your instance, even if you think they do.
I implore post spammers to reconsider the logic behind their actions, as the impact on the fediverse is more negative than positive.
FYI for anyone unaware: blocking users is a core Lemmy feature and blocking with an app should block inside Lemmy itself; meaning if you switch apps or log in from the web, your block list remains intact.
Instance blocking is not a core Lemmy feature (yet) and so if it’s available in your app, be aware that your app is what does the blocking. Meaning if you switch apps or log in from the web that block won’t be there.
It's a feature on an app. There are no filters and you can't block instances unless you're using that one app and apparently in some people's minds everyone uses that one app.
I moved instances recently and have been too lazy to migrate by subscriptions, so I’ve just been browsing on All with Top 6-Hour sort.
The number of bot accounts that just spam post from RSS feeds every 15-30 minutes or so and get zero engagement are infuriating. No one interacts with it! Just give it up!
“There is also a discussion over on Hacker News” well tell hacker news that the news we want to discuss is how to mitigate spam from shitty bots!
If you're using Sync, it's the three dots on any post or comment, then Filter. You can choose to filter (block) the user, the community, the linked website, or the entire instance hosting it.
Three dots usually indicate "options" or "settings" when using Android. I'd invite you to tap those buttons any time you see them and learn more about the tools you are using.
For Sync, "filter" and "block" are separate functions, blocking a user or community will also block them on the site you use, but filtering them only removes the posts locally on Sync.
I feel like this can, and should, be handled client-side. It would be a relatively simple matter of auto-hiding a post where the title is a duplicate match to anything in the last, say, 25 posts. User configurable.
I know that feels like a hack, but for the reasons posted by the top commenters, we don't want to make things weird for parallel communities.
Unfortunately Active or Top just serves me the exact same posts I scrolled through previously in the day. Not sure if it's an app issue or just a lack of content on lemmy overall.