- (CGFloat)heightForTweetCellWithString:(NSString *)text {
  CGFloat height = Buffer + [text sizeWithFont:Font constrainedToSize:Size lineBreakMode:LineBreakMode].height;
  return MAX(height, MinHeight);
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
  NSString *text = // get tweet text for this indexpath
    return [self heightForTweetCellWithString:text];
  }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  static NSString *CellIdentifier = @"TweetCell";
  TweetCell *cell = (TweetCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  if (cell == nil) {
    cell = [self createNewTweetCellFromNib];
  }
  cell.tweet.text = // tweet text
  // set other labels, etc
  return cell;
}