The API offers a method to obtain a list of similarly themed public channels, selected based on similarities in their subscriber bases.
Scheme:
messages.chats#64ff9fd5 chats:Vector<Chat> = messages.Chats;
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channels.getChannelRecommendations#25a71742 flags:# channel:flags.0?InputChannel = messages.Chats;Clients should invoke channels.getChannelRecommendations after joining a channel (passing the channel's peer in channel), automatically displaying a popup with a list of similarly themed channels.
The same method should also be invoked when opening a special "Similar channels" tab in the channel's profile (similar to the Media/Links/Gifs/etc tabs).
The method should also be called without setting the channel flag in the "Similar channels" section of the "Channels" tab of global search, to return a global list of recommended channels, similar to the ones the current user has already joined, see here » for more info.
The maximum number of similar channels that can be recommended by channels.getChannelRecommendations» to Premium/non-Premium users is contained in the recommended_channels_limit_premium/recommended_channels_limit_default app configuration keys.