php - News Feed Database Design Efficiency -

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greetings all, i've seen similar questions asked before no conclusive or tested answers.

i'm designing news feed system using php/mysql similar facebooks. seeing table grow quite large -- inefficiency result in significant bottleneck.

example notifications: (items in bold linked objects)

user_a , user_b commented on user_c's new album.

user_a added new vehicle [his/her] garage.

initially, implemented using excessive columns obj1:type1 | obj2:type2 | etc..

it works fear it's not scalable enough, i'm looking object serialization.

so, example new database set so: 

news_id  |  user_id  |                 news_desc            |   timestamp    2643         904     {user904} , {user890} commented on     sometimestamp                        {user222}'s new {album724}.

anything inside {'s represents data serialized using json.

is smart (efficient / scalable) way move forward?

will difficult separate serialized data rest of string using regular expressions?

what happens if user890 deletes his/her comment? think need more atomic - possibly storing type of action (comment) actioner (user890), generate actual story on fly, heavy caching. issue of translation, if extend site several markets/audiences.


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